What is indicated by an aft center of gravity in terms of aircraft stability?

• A. Increased stability
• B. Decreased stability
• C. No effect on stability
• D. Variable stability depending on load

Answer: (B)

An aft center of gravity leads to decreased stability in an aircraft. When the center of gravity is positioned towards the rear of the aircraft, it reduces the effectiveness of the horizontal stabilizer in maintaining control and stability, particularly in pitch. This configuration can result in a condition known as "nose-up" attitude, making it easier for the aircraft to enter a stall and harder for the pilot to recover from it. The aircraft may respond more vigorously to control inputs, which can lead to a less predictable and potentially dangerous flight condition.

In contrast, an aircraft with a forward center of gravity generally exhibits more stability. This is because the aerodynamic forces tend to produce a restoring moment that helps maintain the aircraft's attitude in flight. Therefore, understanding the implications of center of gravity location is crucial for safe aircraft operation and handling.